How planets form Planets form when a cloud of gas and dust, called a nebula, contracts under the force of gravity into a young star and a swirling disk of matter called a protoplanetary disk. Planets ...

An artist's impression shows the "inside out" planetary system around the star LHS 1903. - ESA An exoplanetary system about 116 light-years from Earth could flip the script on how planets form, ...

NEW YORK (CNN) — An exoplanetary system about 116 light-years from Earth could flip the script on how planets form, according to researchers who discovered it using telescopes from NASA and the ...